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Sagot :
Approximatley 95.4% of the batteries have lifetime between 740 hours and 1,020 hours. O = -2 O = 2
* Fall within 2 std. dev. of mean
Approximatley 68% of the batteries have liftetimes between 810 and 950 hours.
100k for -1 & 1 std. dev.
( 810 & 950)
-1 = x-880/70 1 = x-880/70
-70 = x - 880 70 = x - 880
810 = x 950 = x
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